Yes, You can attack other players homeland and other players can attack yours, but you can't see them on the world map. Still you have social features like chat and friend/ignore list and the community is great so you won't be bored and will have plenty of opportunities to kill or get killed by other players, while the game is in constant development and new stuff are implemented with every patch.

please dont make 2 thread of the same thing mrtrigger, welcome to the forums and hopefully see you ingame! yes you can siege other players and attack their armies and play co-op against large scale AI strongholds.